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[binutils.git] / ld / ldmain.c
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1 /* Main program of GNU linker.
2 Copyright 1991, 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000, 2001,
3 2002
4 Free Software Foundation, Inc.
5 Written by Steve Chamberlain steve@cygnus.com
7 This file is part of GLD, the Gnu Linker.
9 GLD is free software; you can redistribute it and/or modify
10 it under the terms of the GNU General Public License as published by
11 the Free Software Foundation; either version 2, or (at your option)
12 any later version.
14 GLD is distributed in the hope that it will be useful,
15 but WITHOUT ANY WARRANTY; without even the implied warranty of
16 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 GNU General Public License for more details.
19 You should have received a copy of the GNU General Public License
20 along with GLD; see the file COPYING. If not, write to the Free
21 Software Foundation, 59 Temple Place - Suite 330, Boston, MA
22 02111-1307, USA. */
24 #include "bfd.h"
25 #include "sysdep.h"
26 #include <stdio.h>
27 #include "safe-ctype.h"
28 #include "libiberty.h"
29 #include "progress.h"
30 #include "bfdlink.h"
31 #include "filenames.h"
33 #include "ld.h"
34 #include "ldmain.h"
35 #include "ldmisc.h"
36 #include "ldwrite.h"
37 #include "ldexp.h"
38 #include "ldlang.h"
39 #include "ldgram.h"
40 #include "ldlex.h"
41 #include "ldfile.h"
42 #include "ldemul.h"
43 #include "ldctor.h"
45 /* Somewhere above, sys/stat.h got included . . . . */
46 #if !defined(S_ISDIR) && defined(S_IFDIR)
47 #define S_ISDIR(m) (((m) & S_IFMT) == S_IFDIR)
48 #endif
50 #include <string.h>
52 #ifdef HAVE_SBRK
53 #ifdef NEED_DECLARATION_SBRK
54 extern PTR sbrk ();
55 #endif
56 #endif
58 int main PARAMS ((int, char **));
60 static char *get_emulation PARAMS ((int, char **));
61 static void set_scripts_dir PARAMS ((void));
63 /* EXPORTS */
65 char *default_target;
66 const char *output_filename = "a.out";
68 /* Name this program was invoked by. */
69 char *program_name;
71 /* The file that we're creating. */
72 bfd *output_bfd = 0;
74 /* Set by -G argument, for MIPS ECOFF target. */
75 int g_switch_value = 8;
77 /* Nonzero means print names of input files as processed. */
78 boolean trace_files;
80 /* Nonzero means same, but note open failures, too. */
81 boolean trace_file_tries;
83 /* Nonzero means version number was printed, so exit successfully
84 instead of complaining if no input files are given. */
85 boolean version_printed;
87 /* Nonzero means link in every member of an archive. */
88 boolean whole_archive;
90 /* True if we should demangle symbol names. */
91 boolean demangling;
93 args_type command_line;
95 ld_config_type config;
97 static void remove_output PARAMS ((void));
98 static boolean check_for_scripts_dir PARAMS ((char *dir));
99 static boolean add_archive_element PARAMS ((struct bfd_link_info *, bfd *,
100 const char *));
101 static boolean multiple_definition PARAMS ((struct bfd_link_info *,
102 const char *,
103 bfd *, asection *, bfd_vma,
104 bfd *, asection *, bfd_vma));
105 static boolean multiple_common PARAMS ((struct bfd_link_info *,
106 const char *, bfd *,
107 enum bfd_link_hash_type, bfd_vma,
108 bfd *, enum bfd_link_hash_type,
109 bfd_vma));
110 static boolean add_to_set PARAMS ((struct bfd_link_info *,
111 struct bfd_link_hash_entry *,
112 bfd_reloc_code_real_type,
113 bfd *, asection *, bfd_vma));
114 static boolean constructor_callback PARAMS ((struct bfd_link_info *,
115 boolean constructor,
116 const char *name,
117 bfd *, asection *, bfd_vma));
118 static boolean warning_callback PARAMS ((struct bfd_link_info *,
119 const char *, const char *, bfd *,
120 asection *, bfd_vma));
121 static void warning_find_reloc PARAMS ((bfd *, asection *, PTR));
122 static boolean undefined_symbol PARAMS ((struct bfd_link_info *,
123 const char *, bfd *,
124 asection *, bfd_vma, boolean));
125 static boolean reloc_overflow PARAMS ((struct bfd_link_info *, const char *,
126 const char *, bfd_vma,
127 bfd *, asection *, bfd_vma));
128 static boolean reloc_dangerous PARAMS ((struct bfd_link_info *, const char *,
129 bfd *, asection *, bfd_vma));
130 static boolean unattached_reloc PARAMS ((struct bfd_link_info *,
131 const char *, bfd *, asection *,
132 bfd_vma));
133 static boolean notice PARAMS ((struct bfd_link_info *, const char *,
134 bfd *, asection *, bfd_vma));
136 static struct bfd_link_callbacks link_callbacks = {
137 add_archive_element,
138 multiple_definition,
139 multiple_common,
140 add_to_set,
141 constructor_callback,
142 warning_callback,
143 undefined_symbol,
144 reloc_overflow,
145 reloc_dangerous,
146 unattached_reloc,
147 notice
150 struct bfd_link_info link_info;
152 static void
153 remove_output ()
155 if (output_filename)
157 if (output_bfd && output_bfd->iostream)
158 fclose ((FILE *) (output_bfd->iostream));
159 if (delete_output_file_on_failure)
160 unlink (output_filename);
165 main (argc, argv)
166 int argc;
167 char **argv;
169 char *emulation;
170 long start_time = get_run_time ();
172 #if defined (HAVE_SETLOCALE) && defined (HAVE_LC_MESSAGES)
173 setlocale (LC_MESSAGES, "");
174 #endif
175 #if defined (HAVE_SETLOCALE)
176 setlocale (LC_CTYPE, "");
177 #endif
178 bindtextdomain (PACKAGE, LOCALEDIR);
179 textdomain (PACKAGE);
181 program_name = argv[0];
182 xmalloc_set_program_name (program_name);
184 START_PROGRESS (program_name, 0);
186 bfd_init ();
188 bfd_set_error_program_name (program_name);
190 xatexit (remove_output);
192 /* Set the default BFD target based on the configured target. Doing
193 this permits the linker to be configured for a particular target,
194 and linked against a shared BFD library which was configured for
195 a different target. The macro TARGET is defined by Makefile. */
196 if (! bfd_set_default_target (TARGET))
198 einfo (_("%X%P: can't set BFD default target to `%s': %E\n"), TARGET);
199 xexit (1);
202 #if YYDEBUG
204 extern int yydebug;
205 yydebug = 1;
207 #endif
209 /* Initialize the data about options. */
210 trace_files = trace_file_tries = version_printed = false;
211 whole_archive = false;
212 config.build_constructors = true;
213 config.dynamic_link = false;
214 config.has_shared = false;
215 config.split_by_reloc = (unsigned) -1;
216 config.split_by_file = (bfd_size_type) -1;
217 command_line.force_common_definition = false;
218 command_line.inhibit_common_definition = false;
219 command_line.interpreter = NULL;
220 command_line.rpath = NULL;
221 command_line.warn_mismatch = true;
222 command_line.check_section_addresses = true;
224 /* We initialize DEMANGLING based on the environment variable
225 COLLECT_NO_DEMANGLE. The gcc collect2 program will demangle the
226 output of the linker, unless COLLECT_NO_DEMANGLE is set in the
227 environment. Acting the same way here lets us provide the same
228 interface by default. */
229 demangling = getenv ("COLLECT_NO_DEMANGLE") == NULL;
231 link_info.callbacks = &link_callbacks;
232 link_info.relocateable = false;
233 link_info.emitrelocations = false;
234 link_info.shared = false;
235 link_info.symbolic = false;
236 link_info.export_dynamic = false;
237 link_info.static_link = false;
238 link_info.traditional_format = false;
239 link_info.optimize = false;
240 link_info.no_undefined = false;
241 link_info.allow_shlib_undefined = false;
242 link_info.allow_multiple_definition = false;
243 link_info.allow_undefined_version = true;
244 link_info.strip = strip_none;
245 link_info.discard = discard_sec_merge;
246 link_info.keep_memory = true;
247 link_info.input_bfds = NULL;
248 link_info.create_object_symbols_section = NULL;
249 link_info.gc_sym_list = NULL;
250 link_info.hash = NULL;
251 link_info.keep_hash = NULL;
252 link_info.notice_all = false;
253 link_info.notice_hash = NULL;
254 link_info.wrap_hash = NULL;
255 link_info.mpc860c0 = 0;
256 /* SVR4 linkers seem to set DT_INIT and DT_FINI based on magic _init
257 and _fini symbols. We are compatible. */
258 link_info.init_function = "_init";
259 link_info.fini_function = "_fini";
260 link_info.new_dtags = false;
261 link_info.eh_frame_hdr = false;
262 link_info.flags = (bfd_vma) 0;
263 link_info.flags_1 = (bfd_vma) 0;
264 link_info.pei386_auto_import = false;
265 link_info.pei386_auto_import = -1;
266 link_info.combreloc = true;
267 link_info.spare_dynamic_tags = 5;
268 link_info.common_skip_ar_aymbols = bfd_link_common_skip_none;
270 ldfile_add_arch ("");
272 config.make_executable = true;
273 force_make_executable = false;
274 config.magic_demand_paged = true;
275 config.text_read_only = true;
277 emulation = get_emulation (argc, argv);
278 ldemul_choose_mode (emulation);
279 default_target = ldemul_choose_target (argc, argv);
280 lang_init ();
281 ldemul_before_parse ();
282 lang_has_input_file = false;
283 parse_args (argc, argv);
285 ldemul_set_symbols ();
287 if (link_info.relocateable)
289 if (command_line.gc_sections)
290 einfo ("%P%F: --gc-sections and -r may not be used together\n");
291 if (link_info.mpc860c0)
292 einfo (_("%P%F: -r and --mpc860c0 may not be used together\n"));
293 else if (command_line.relax)
294 einfo (_("%P%F: --relax and -r may not be used together\n"));
295 if (link_info.shared)
296 einfo (_("%P%F: -r and -shared may not be used together\n"));
299 if (! link_info.shared)
301 if (command_line.filter_shlib)
302 einfo (_("%P%F: -F may not be used without -shared\n"));
303 if (command_line.auxiliary_filters)
304 einfo (_("%P%F: -f may not be used without -shared\n"));
307 /* Treat ld -r -s as ld -r -S -x (i.e., strip all local symbols). I
308 don't see how else this can be handled, since in this case we
309 must preserve all externally visible symbols. */
310 if (link_info.relocateable && link_info.strip == strip_all)
312 link_info.strip = strip_debugger;
313 if (link_info.discard == discard_sec_merge)
314 link_info.discard = discard_all;
317 /* This essentially adds another -L directory so this must be done after
318 the -L's in argv have been processed. */
319 set_scripts_dir ();
321 /* If we have not already opened and parsed a linker script
322 read the emulation's appropriate default script. */
323 if (saved_script_handle == NULL)
325 int isfile;
326 char *s = ldemul_get_script (&isfile);
328 if (isfile)
329 ldfile_open_command_file (s);
330 else
332 lex_string = s;
333 lex_redirect (s);
335 parser_input = input_script;
336 yyparse ();
337 lex_string = NULL;
340 if (trace_file_tries)
342 if (saved_script_handle)
343 info_msg (_("using external linker script:"));
344 else
345 info_msg (_("using internal linker script:"));
346 info_msg ("\n==================================================\n");
348 if (saved_script_handle)
350 static const int ld_bufsz = 8193;
351 size_t n;
352 char *buf = xmalloc (ld_bufsz);
354 rewind (saved_script_handle);
355 while ((n = fread (buf, 1, ld_bufsz - 1, saved_script_handle)) > 0)
357 buf[n] = 0;
358 info_msg (buf);
360 rewind (saved_script_handle);
361 free (buf);
363 else
365 int isfile;
367 info_msg (ldemul_get_script (&isfile));
370 info_msg ("\n==================================================\n");
373 lang_final ();
375 if (lang_has_input_file == false)
377 if (version_printed)
378 xexit (0);
379 einfo (_("%P%F: no input files\n"));
382 if (trace_files)
384 info_msg (_("%P: mode %s\n"), emulation);
387 ldemul_after_parse ();
389 if (config.map_filename)
391 if (strcmp (config.map_filename, "-") == 0)
393 config.map_file = stdout;
395 else
397 config.map_file = fopen (config.map_filename, FOPEN_WT);
398 if (config.map_file == (FILE *) NULL)
400 bfd_set_error (bfd_error_system_call);
401 einfo (_("%P%F: cannot open map file %s: %E\n"),
402 config.map_filename);
407 lang_process ();
409 /* Print error messages for any missing symbols, for any warning
410 symbols, and possibly multiple definitions. */
412 if (link_info.relocateable)
413 output_bfd->flags &= ~EXEC_P;
414 else
415 output_bfd->flags |= EXEC_P;
417 ldwrite ();
419 if (config.map_file != NULL)
420 lang_map ();
421 if (command_line.cref)
422 output_cref (config.map_file != NULL ? config.map_file : stdout);
423 if (nocrossref_list != NULL)
424 check_nocrossrefs ();
426 /* Even if we're producing relocateable output, some non-fatal errors should
427 be reported in the exit status. (What non-fatal errors, if any, do we
428 want to ignore for relocateable output?) */
430 if (config.make_executable == false && force_make_executable == false)
432 if (trace_files == true)
434 einfo (_("%P: link errors found, deleting executable `%s'\n"),
435 output_filename);
438 /* The file will be removed by remove_output. */
440 xexit (1);
442 else
444 if (! bfd_close (output_bfd))
445 einfo (_("%F%B: final close failed: %E\n"), output_bfd);
447 /* If the --force-exe-suffix is enabled, and we're making an
448 executable file and it doesn't end in .exe, copy it to one
449 which does. */
450 if (! link_info.relocateable && command_line.force_exe_suffix)
452 int len = strlen (output_filename);
453 if (len < 4
454 || (strcasecmp (output_filename + len - 4, ".exe") != 0
455 && strcasecmp (output_filename + len - 4, ".dll") != 0))
457 FILE *src;
458 FILE *dst;
459 const int bsize = 4096;
460 char *buf = xmalloc (bsize);
461 int l;
462 char *dst_name = xmalloc (len + 5);
463 strcpy (dst_name, output_filename);
464 strcat (dst_name, ".exe");
465 src = fopen (output_filename, FOPEN_RB);
466 dst = fopen (dst_name, FOPEN_WB);
468 if (!src)
469 einfo (_("%X%P: unable to open for source of copy `%s'\n"), output_filename);
470 if (!dst)
471 einfo (_("%X%P: unable to open for destination of copy `%s'\n"), dst_name);
472 while ((l = fread (buf, 1, bsize, src)) > 0)
474 int done = fwrite (buf, 1, l, dst);
475 if (done != l)
477 einfo (_("%P: Error writing file `%s'\n"), dst_name);
480 fclose (src);
481 if (fclose (dst) == EOF)
483 einfo (_("%P: Error closing file `%s'\n"), dst_name);
485 free (dst_name);
486 free (buf);
491 END_PROGRESS (program_name);
493 if (config.stats)
495 #ifdef HAVE_SBRK
496 char *lim = (char *) sbrk (0);
497 #endif
498 long run_time = get_run_time () - start_time;
500 fprintf (stderr, _("%s: total time in link: %ld.%06ld\n"),
501 program_name, run_time / 1000000, run_time % 1000000);
502 #ifdef HAVE_SBRK
503 fprintf (stderr, _("%s: data size %ld\n"), program_name,
504 (long) (lim - (char *) &environ));
505 #endif
508 /* Prevent remove_output from doing anything, after a successful link. */
509 output_filename = NULL;
511 xexit (0);
512 return 0;
515 /* We need to find any explicitly given emulation in order to initialize the
516 state that's needed by the lex&yacc argument parser (parse_args). */
518 static char *
519 get_emulation (argc, argv)
520 int argc;
521 char **argv;
523 char *emulation;
524 int i;
526 emulation = getenv (EMULATION_ENVIRON);
527 if (emulation == NULL)
528 emulation = DEFAULT_EMULATION;
530 for (i = 1; i < argc; i++)
532 if (!strncmp (argv[i], "-m", 2))
534 if (argv[i][2] == '\0')
536 /* -m EMUL */
537 if (i < argc - 1)
539 emulation = argv[i + 1];
540 i++;
542 else
544 einfo (_("%P%F: missing argument to -m\n"));
547 else if (strcmp (argv[i], "-mips1") == 0
548 || strcmp (argv[i], "-mips2") == 0
549 || strcmp (argv[i], "-mips3") == 0
550 || strcmp (argv[i], "-mips32") == 0
551 || strcmp (argv[i], "-mips64") == 0
552 || strcmp (argv[i], "-mips4") == 0
553 || strcmp (argv[i], "-mips5") == 0)
555 /* FIXME: The arguments -mips1, -mips2, -mips3, etc. are
556 passed to the linker by some MIPS compilers. They
557 generally tell the linker to use a slightly different
558 library path. Perhaps someday these should be
559 implemented as emulations; until then, we just ignore
560 the arguments and hope that nobody ever creates
561 emulations named ips1, ips2 or ips3. */
563 else if (strcmp (argv[i], "-m486") == 0)
565 /* FIXME: The argument -m486 is passed to the linker on
566 some Linux systems. Hope that nobody creates an
567 emulation named 486. */
569 else
571 /* -mEMUL */
572 emulation = &argv[i][2];
577 return emulation;
580 /* If directory DIR contains an "ldscripts" subdirectory,
581 add DIR to the library search path and return true,
582 else return false. */
584 static boolean
585 check_for_scripts_dir (dir)
586 char *dir;
588 size_t dirlen;
589 char *buf;
590 struct stat s;
591 boolean res;
593 dirlen = strlen (dir);
594 /* sizeof counts the terminating NUL. */
595 buf = (char *) xmalloc (dirlen + sizeof ("/ldscripts"));
596 sprintf (buf, "%s/ldscripts", dir);
598 res = stat (buf, &s) == 0 && S_ISDIR (s.st_mode);
599 free (buf);
600 if (res)
601 ldfile_add_library_path (dir, false);
602 return res;
605 /* Set the default directory for finding script files.
606 Libraries will be searched for here too, but that's ok.
607 We look for the "ldscripts" directory in:
609 SCRIPTDIR (passed from Makefile)
610 the dir where this program is (for using it from the build tree)
611 the dir where this program is/../lib (for installing the tool suite elsewhere) */
613 static void
614 set_scripts_dir ()
616 char *end, *dir;
617 size_t dirlen;
619 if (check_for_scripts_dir (SCRIPTDIR))
620 /* We've been installed normally. */
621 return;
623 /* Look for "ldscripts" in the dir where our binary is. */
624 end = strrchr (program_name, '/');
625 #ifdef HAVE_DOS_BASED_FILE_SYSTEM
627 /* We could have \foo\bar, or /foo\bar. */
628 char *bslash = strrchr (program_name, '\\');
629 if (end == NULL || (bslash != NULL && bslash > end))
630 end = bslash;
632 #endif
634 if (end == NULL)
636 /* Don't look for ldscripts in the current directory. There is
637 too much potential for confusion. */
638 return;
641 dirlen = end - program_name;
642 /* Make a copy of program_name in dir.
643 Leave room for later "/../lib". */
644 dir = (char *) xmalloc (dirlen + 8);
645 strncpy (dir, program_name, dirlen);
646 dir[dirlen] = '\0';
648 if (check_for_scripts_dir (dir))
649 /* Don't free dir. */
650 return;
652 /* Look for "ldscripts" in <the dir where our binary is>/../lib. */
653 strcpy (dir + dirlen, "/../lib");
654 if (check_for_scripts_dir (dir))
655 return;
657 /* Well, we tried. */
658 free (dir);
661 void
662 add_ysym (name)
663 const char *name;
665 if (link_info.notice_hash == (struct bfd_hash_table *) NULL)
667 link_info.notice_hash = ((struct bfd_hash_table *)
668 xmalloc (sizeof (struct bfd_hash_table)));
669 if (! bfd_hash_table_init_n (link_info.notice_hash,
670 bfd_hash_newfunc,
671 61))
672 einfo (_("%P%F: bfd_hash_table_init failed: %E\n"));
675 if (bfd_hash_lookup (link_info.notice_hash, name, true, true)
676 == (struct bfd_hash_entry *) NULL)
677 einfo (_("%P%F: bfd_hash_lookup failed: %E\n"));
680 /* Record a symbol to be wrapped, from the --wrap option. */
682 void
683 add_wrap (name)
684 const char *name;
686 if (link_info.wrap_hash == NULL)
688 link_info.wrap_hash = ((struct bfd_hash_table *)
689 xmalloc (sizeof (struct bfd_hash_table)));
690 if (! bfd_hash_table_init_n (link_info.wrap_hash,
691 bfd_hash_newfunc,
692 61))
693 einfo (_("%P%F: bfd_hash_table_init failed: %E\n"));
695 if (bfd_hash_lookup (link_info.wrap_hash, name, true, true) == NULL)
696 einfo (_("%P%F: bfd_hash_lookup failed: %E\n"));
699 /* Handle the -retain-symbols-file option. */
701 void
702 add_keepsyms_file (filename)
703 const char *filename;
705 FILE *file;
706 char *buf;
707 size_t bufsize;
708 int c;
710 if (link_info.strip == strip_some)
711 einfo (_("%X%P: error: duplicate retain-symbols-file\n"));
713 file = fopen (filename, "r");
714 if (file == (FILE *) NULL)
716 bfd_set_error (bfd_error_system_call);
717 einfo ("%X%P: %s: %E\n", filename);
718 return;
721 link_info.keep_hash = ((struct bfd_hash_table *)
722 xmalloc (sizeof (struct bfd_hash_table)));
723 if (! bfd_hash_table_init (link_info.keep_hash, bfd_hash_newfunc))
724 einfo (_("%P%F: bfd_hash_table_init failed: %E\n"));
726 bufsize = 100;
727 buf = (char *) xmalloc (bufsize);
729 c = getc (file);
730 while (c != EOF)
732 while (ISSPACE (c))
733 c = getc (file);
735 if (c != EOF)
737 size_t len = 0;
739 while (! ISSPACE (c) && c != EOF)
741 buf[len] = c;
742 ++len;
743 if (len >= bufsize)
745 bufsize *= 2;
746 buf = xrealloc (buf, bufsize);
748 c = getc (file);
751 buf[len] = '\0';
753 if (bfd_hash_lookup (link_info.keep_hash, buf, true, true)
754 == (struct bfd_hash_entry *) NULL)
755 einfo (_("%P%F: bfd_hash_lookup for insertion failed: %E\n"));
759 if (link_info.strip != strip_none)
760 einfo (_("%P: `-retain-symbols-file' overrides `-s' and `-S'\n"));
762 link_info.strip = strip_some;
765 /* Callbacks from the BFD linker routines. */
767 /* This is called when BFD has decided to include an archive member in
768 a link. */
770 static boolean
771 add_archive_element (info, abfd, name)
772 struct bfd_link_info *info ATTRIBUTE_UNUSED;
773 bfd *abfd;
774 const char *name;
776 lang_input_statement_type *input;
778 input = ((lang_input_statement_type *)
779 xmalloc (sizeof (lang_input_statement_type)));
780 input->filename = abfd->filename;
781 input->local_sym_name = abfd->filename;
782 input->the_bfd = abfd;
783 input->asymbols = NULL;
784 input->next = NULL;
785 input->just_syms_flag = false;
786 input->loaded = false;
787 input->search_dirs_flag = false;
789 /* FIXME: The following fields are not set: header.next,
790 header.type, closed, passive_position, symbol_count,
791 next_real_file, is_archive, target, real. This bit of code is
792 from the old decode_library_subfile function. I don't know
793 whether any of those fields matters. */
795 ldlang_add_file (input);
797 if (config.map_file != (FILE *) NULL)
799 static boolean header_printed;
800 struct bfd_link_hash_entry *h;
801 bfd *from;
802 int len;
804 h = bfd_link_hash_lookup (link_info.hash, name, false, false, true);
806 if (h == NULL)
807 from = NULL;
808 else
810 switch (h->type)
812 default:
813 from = NULL;
814 break;
816 case bfd_link_hash_defined:
817 case bfd_link_hash_defweak:
818 from = h->u.def.section->owner;
819 break;
821 case bfd_link_hash_undefined:
822 case bfd_link_hash_undefweak:
823 from = h->u.undef.abfd;
824 break;
826 case bfd_link_hash_common:
827 from = h->u.c.p->section->owner;
828 break;
832 if (! header_printed)
834 char buf[100];
836 sprintf (buf, _("Archive member included because of file (symbol)\n\n"));
837 minfo ("%s", buf);
838 header_printed = true;
841 if (bfd_my_archive (abfd) == NULL)
843 minfo ("%s", bfd_get_filename (abfd));
844 len = strlen (bfd_get_filename (abfd));
846 else
848 minfo ("%s(%s)", bfd_get_filename (bfd_my_archive (abfd)),
849 bfd_get_filename (abfd));
850 len = (strlen (bfd_get_filename (bfd_my_archive (abfd)))
851 + strlen (bfd_get_filename (abfd))
852 + 2);
855 if (len >= 29)
857 print_nl ();
858 len = 0;
860 while (len < 30)
862 print_space ();
863 ++len;
866 if (from != NULL)
867 minfo ("%B ", from);
868 if (h != NULL)
869 minfo ("(%T)\n", h->root.string);
870 else
871 minfo ("(%s)\n", name);
874 if (trace_files || trace_file_tries)
875 info_msg ("%I\n", input);
877 return true;
880 /* This is called when BFD has discovered a symbol which is defined
881 multiple times. */
883 static boolean
884 multiple_definition (info, name, obfd, osec, oval, nbfd, nsec, nval)
885 struct bfd_link_info *info ATTRIBUTE_UNUSED;
886 const char *name;
887 bfd *obfd;
888 asection *osec;
889 bfd_vma oval;
890 bfd *nbfd;
891 asection *nsec;
892 bfd_vma nval;
894 /* If either section has the output_section field set to
895 bfd_abs_section_ptr, it means that the section is being
896 discarded, and this is not really a multiple definition at all.
897 FIXME: It would be cleaner to somehow ignore symbols defined in
898 sections which are being discarded. */
899 if ((osec->output_section != NULL
900 && ! bfd_is_abs_section (osec)
901 && bfd_is_abs_section (osec->output_section))
902 || (nsec->output_section != NULL
903 && ! bfd_is_abs_section (nsec)
904 && bfd_is_abs_section (nsec->output_section)))
905 return true;
907 einfo (_("%X%C: multiple definition of `%T'\n"),
908 nbfd, nsec, nval, name);
909 if (obfd != (bfd *) NULL)
910 einfo (_("%D: first defined here\n"), obfd, osec, oval);
912 if (command_line.relax)
914 einfo (_("%P: Disabling relaxation: it will not work with multiple definitions\n"));
915 command_line.relax = 0;
918 return true;
921 /* This is called when there is a definition of a common symbol, or
922 when a common symbol is found for a symbol that is already defined,
923 or when two common symbols are found. We only do something if
924 -warn-common was used. */
926 static boolean
927 multiple_common (info, name, obfd, otype, osize, nbfd, ntype, nsize)
928 struct bfd_link_info *info ATTRIBUTE_UNUSED;
929 const char *name;
930 bfd *obfd;
931 enum bfd_link_hash_type otype;
932 bfd_vma osize;
933 bfd *nbfd;
934 enum bfd_link_hash_type ntype;
935 bfd_vma nsize;
937 if (! config.warn_common)
938 return true;
940 if (ntype == bfd_link_hash_defined
941 || ntype == bfd_link_hash_defweak
942 || ntype == bfd_link_hash_indirect)
944 ASSERT (otype == bfd_link_hash_common);
945 einfo (_("%B: warning: definition of `%T' overriding common\n"),
946 nbfd, name);
947 if (obfd != NULL)
948 einfo (_("%B: warning: common is here\n"), obfd);
950 else if (otype == bfd_link_hash_defined
951 || otype == bfd_link_hash_defweak
952 || otype == bfd_link_hash_indirect)
954 ASSERT (ntype == bfd_link_hash_common);
955 einfo (_("%B: warning: common of `%T' overridden by definition\n"),
956 nbfd, name);
957 if (obfd != NULL)
958 einfo (_("%B: warning: defined here\n"), obfd);
960 else
962 ASSERT (otype == bfd_link_hash_common && ntype == bfd_link_hash_common);
963 if (osize > nsize)
965 einfo (_("%B: warning: common of `%T' overridden by larger common\n"),
966 nbfd, name);
967 if (obfd != NULL)
968 einfo (_("%B: warning: larger common is here\n"), obfd);
970 else if (nsize > osize)
972 einfo (_("%B: warning: common of `%T' overriding smaller common\n"),
973 nbfd, name);
974 if (obfd != NULL)
975 einfo (_("%B: warning: smaller common is here\n"), obfd);
977 else
979 einfo (_("%B: warning: multiple common of `%T'\n"), nbfd, name);
980 if (obfd != NULL)
981 einfo (_("%B: warning: previous common is here\n"), obfd);
985 return true;
988 /* This is called when BFD has discovered a set element. H is the
989 entry in the linker hash table for the set. SECTION and VALUE
990 represent a value which should be added to the set. */
992 static boolean
993 add_to_set (info, h, reloc, abfd, section, value)
994 struct bfd_link_info *info ATTRIBUTE_UNUSED;
995 struct bfd_link_hash_entry *h;
996 bfd_reloc_code_real_type reloc;
997 bfd *abfd;
998 asection *section;
999 bfd_vma value;
1001 if (config.warn_constructors)
1002 einfo (_("%P: warning: global constructor %s used\n"),
1003 h->root.string);
1005 if (! config.build_constructors)
1006 return true;
1008 ldctor_add_set_entry (h, reloc, (const char *) NULL, section, value);
1010 if (h->type == bfd_link_hash_new)
1012 h->type = bfd_link_hash_undefined;
1013 h->u.undef.abfd = abfd;
1014 /* We don't call bfd_link_add_undef to add this to the list of
1015 undefined symbols because we are going to define it
1016 ourselves. */
1019 return true;
1022 /* This is called when BFD has discovered a constructor. This is only
1023 called for some object file formats--those which do not handle
1024 constructors in some more clever fashion. This is similar to
1025 adding an element to a set, but less general. */
1027 static boolean
1028 constructor_callback (info, constructor, name, abfd, section, value)
1029 struct bfd_link_info *info;
1030 boolean constructor;
1031 const char *name;
1032 bfd *abfd;
1033 asection *section;
1034 bfd_vma value;
1036 char *s;
1037 struct bfd_link_hash_entry *h;
1038 char set_name[1 + sizeof "__CTOR_LIST__"];
1040 if (config.warn_constructors)
1041 einfo (_("%P: warning: global constructor %s used\n"), name);
1043 if (! config.build_constructors)
1044 return true;
1046 /* Ensure that BFD_RELOC_CTOR exists now, so that we can give a
1047 useful error message. */
1048 if (bfd_reloc_type_lookup (output_bfd, BFD_RELOC_CTOR) == NULL
1049 && (link_info.relocateable
1050 || bfd_reloc_type_lookup (abfd, BFD_RELOC_CTOR) == NULL))
1051 einfo (_("%P%F: BFD backend error: BFD_RELOC_CTOR unsupported\n"));
1053 s = set_name;
1054 if (bfd_get_symbol_leading_char (abfd) != '\0')
1055 *s++ = bfd_get_symbol_leading_char (abfd);
1056 if (constructor)
1057 strcpy (s, "__CTOR_LIST__");
1058 else
1059 strcpy (s, "__DTOR_LIST__");
1061 h = bfd_link_hash_lookup (info->hash, set_name, true, true, true);
1062 if (h == (struct bfd_link_hash_entry *) NULL)
1063 einfo (_("%P%F: bfd_link_hash_lookup failed: %E\n"));
1064 if (h->type == bfd_link_hash_new)
1066 h->type = bfd_link_hash_undefined;
1067 h->u.undef.abfd = abfd;
1068 /* We don't call bfd_link_add_undef to add this to the list of
1069 undefined symbols because we are going to define it
1070 ourselves. */
1073 ldctor_add_set_entry (h, BFD_RELOC_CTOR, name, section, value);
1074 return true;
1077 /* A structure used by warning_callback to pass information through
1078 bfd_map_over_sections. */
1080 struct warning_callback_info {
1081 boolean found;
1082 const char *warning;
1083 const char *symbol;
1084 asymbol **asymbols;
1087 /* This is called when there is a reference to a warning symbol. */
1089 static boolean
1090 warning_callback (info, warning, symbol, abfd, section, address)
1091 struct bfd_link_info *info ATTRIBUTE_UNUSED;
1092 const char *warning;
1093 const char *symbol;
1094 bfd *abfd;
1095 asection *section;
1096 bfd_vma address;
1098 /* This is a hack to support warn_multiple_gp. FIXME: This should
1099 have a cleaner interface, but what? */
1100 if (! config.warn_multiple_gp
1101 && strcmp (warning, "using multiple gp values") == 0)
1102 return true;
1104 if (section != NULL)
1105 einfo ("%C: %s\n", abfd, section, address, warning);
1106 else if (abfd == NULL)
1107 einfo ("%P: %s\n", warning);
1108 else if (symbol == NULL)
1109 einfo ("%B: %s\n", abfd, warning);
1110 else
1112 lang_input_statement_type *entry;
1113 asymbol **asymbols;
1114 struct warning_callback_info info;
1116 /* Look through the relocs to see if we can find a plausible
1117 address. */
1119 entry = (lang_input_statement_type *) abfd->usrdata;
1120 if (entry != NULL && entry->asymbols != NULL)
1121 asymbols = entry->asymbols;
1122 else
1124 long symsize;
1125 long symbol_count;
1127 symsize = bfd_get_symtab_upper_bound (abfd);
1128 if (symsize < 0)
1129 einfo (_("%B%F: could not read symbols: %E\n"), abfd);
1130 asymbols = (asymbol **) xmalloc (symsize);
1131 symbol_count = bfd_canonicalize_symtab (abfd, asymbols);
1132 if (symbol_count < 0)
1133 einfo (_("%B%F: could not read symbols: %E\n"), abfd);
1134 if (entry != NULL)
1136 entry->asymbols = asymbols;
1137 entry->symbol_count = symbol_count;
1141 info.found = false;
1142 info.warning = warning;
1143 info.symbol = symbol;
1144 info.asymbols = asymbols;
1145 bfd_map_over_sections (abfd, warning_find_reloc, (PTR) &info);
1147 if (! info.found)
1148 einfo ("%B: %s\n", abfd, warning);
1150 if (entry == NULL)
1151 free (asymbols);
1154 return true;
1157 /* This is called by warning_callback for each section. It checks the
1158 relocs of the section to see if it can find a reference to the
1159 symbol which triggered the warning. If it can, it uses the reloc
1160 to give an error message with a file and line number. */
1162 static void
1163 warning_find_reloc (abfd, sec, iarg)
1164 bfd *abfd;
1165 asection *sec;
1166 PTR iarg;
1168 struct warning_callback_info *info = (struct warning_callback_info *) iarg;
1169 long relsize;
1170 arelent **relpp;
1171 long relcount;
1172 arelent **p, **pend;
1174 if (info->found)
1175 return;
1177 relsize = bfd_get_reloc_upper_bound (abfd, sec);
1178 if (relsize < 0)
1179 einfo (_("%B%F: could not read relocs: %E\n"), abfd);
1180 if (relsize == 0)
1181 return;
1183 relpp = (arelent **) xmalloc (relsize);
1184 relcount = bfd_canonicalize_reloc (abfd, sec, relpp, info->asymbols);
1185 if (relcount < 0)
1186 einfo (_("%B%F: could not read relocs: %E\n"), abfd);
1188 p = relpp;
1189 pend = p + relcount;
1190 for (; p < pend && *p != NULL; p++)
1192 arelent *q = *p;
1194 if (q->sym_ptr_ptr != NULL
1195 && *q->sym_ptr_ptr != NULL
1196 && strcmp (bfd_asymbol_name (*q->sym_ptr_ptr), info->symbol) == 0)
1198 /* We found a reloc for the symbol we are looking for. */
1199 einfo ("%C: %s\n", abfd, sec, q->address, info->warning);
1200 info->found = true;
1201 break;
1205 free (relpp);
1208 /* This is called when an undefined symbol is found. */
1210 static boolean
1211 undefined_symbol (info, name, abfd, section, address, fatal)
1212 struct bfd_link_info *info ATTRIBUTE_UNUSED;
1213 const char *name;
1214 bfd *abfd;
1215 asection *section;
1216 bfd_vma address;
1217 boolean fatal ATTRIBUTE_UNUSED;
1219 static char *error_name;
1220 static unsigned int error_count;
1222 #define MAX_ERRORS_IN_A_ROW 5
1224 if (config.warn_once)
1226 static struct bfd_hash_table *hash;
1228 /* Only warn once about a particular undefined symbol. */
1230 if (hash == NULL)
1232 hash = ((struct bfd_hash_table *)
1233 xmalloc (sizeof (struct bfd_hash_table)));
1234 if (! bfd_hash_table_init (hash, bfd_hash_newfunc))
1235 einfo (_("%F%P: bfd_hash_table_init failed: %E\n"));
1238 if (bfd_hash_lookup (hash, name, false, false) != NULL)
1239 return true;
1241 if (bfd_hash_lookup (hash, name, true, true) == NULL)
1242 einfo (_("%F%P: bfd_hash_lookup failed: %E\n"));
1245 /* We never print more than a reasonable number of errors in a row
1246 for a single symbol. */
1247 if (error_name != (char *) NULL
1248 && strcmp (name, error_name) == 0)
1249 ++error_count;
1250 else
1252 error_count = 0;
1253 if (error_name != (char *) NULL)
1254 free (error_name);
1255 error_name = xstrdup (name);
1258 if (section != NULL)
1260 if (error_count < MAX_ERRORS_IN_A_ROW)
1262 einfo (_("%C: undefined reference to `%T'\n"),
1263 abfd, section, address, name);
1264 if (fatal)
1265 einfo ("%X");
1267 else if (error_count == MAX_ERRORS_IN_A_ROW)
1268 einfo (_("%D: more undefined references to `%T' follow\n"),
1269 abfd, section, address, name);
1271 else
1273 if (error_count < MAX_ERRORS_IN_A_ROW)
1275 einfo (_("%B: undefined reference to `%T'\n"),
1276 abfd, name);
1277 if (fatal)
1278 einfo ("%X");
1280 else if (error_count == MAX_ERRORS_IN_A_ROW)
1281 einfo (_("%B: more undefined references to `%T' follow\n"),
1282 abfd, name);
1285 return true;
1288 /* This is called when a reloc overflows. */
1290 static boolean
1291 reloc_overflow (info, name, reloc_name, addend, abfd, section, address)
1292 struct bfd_link_info *info ATTRIBUTE_UNUSED;
1293 const char *name;
1294 const char *reloc_name;
1295 bfd_vma addend;
1296 bfd *abfd;
1297 asection *section;
1298 bfd_vma address;
1300 if (abfd == (bfd *) NULL)
1301 einfo (_("%P%X: generated"));
1302 else
1303 einfo ("%X%C:", abfd, section, address);
1304 einfo (_(" relocation truncated to fit: %s %T"), reloc_name, name);
1305 if (addend != 0)
1306 einfo ("+%v", addend);
1307 einfo ("\n");
1308 return true;
1311 /* This is called when a dangerous relocation is made. */
1313 static boolean
1314 reloc_dangerous (info, message, abfd, section, address)
1315 struct bfd_link_info *info ATTRIBUTE_UNUSED;
1316 const char *message;
1317 bfd *abfd;
1318 asection *section;
1319 bfd_vma address;
1321 if (abfd == (bfd *) NULL)
1322 einfo (_("%P%X: generated"));
1323 else
1324 einfo ("%X%C:", abfd, section, address);
1325 einfo (_("dangerous relocation: %s\n"), message);
1326 return true;
1329 /* This is called when a reloc is being generated attached to a symbol
1330 that is not being output. */
1332 static boolean
1333 unattached_reloc (info, name, abfd, section, address)
1334 struct bfd_link_info *info ATTRIBUTE_UNUSED;
1335 const char *name;
1336 bfd *abfd;
1337 asection *section;
1338 bfd_vma address;
1340 if (abfd == (bfd *) NULL)
1341 einfo (_("%P%X: generated"));
1342 else
1343 einfo ("%X%C:", abfd, section, address);
1344 einfo (_(" reloc refers to symbol `%T' which is not being output\n"), name);
1345 return true;
1348 /* This is called if link_info.notice_all is set, or when a symbol in
1349 link_info.notice_hash is found. Symbols are put in notice_hash
1350 using the -y option. */
1352 static boolean
1353 notice (info, name, abfd, section, value)
1354 struct bfd_link_info *info;
1355 const char *name;
1356 bfd *abfd;
1357 asection *section;
1358 bfd_vma value;
1360 if (! info->notice_all
1361 || (info->notice_hash != NULL
1362 && bfd_hash_lookup (info->notice_hash, name, false, false) != NULL))
1364 if (bfd_is_und_section (section))
1365 einfo ("%B: reference to %s\n", abfd, name);
1366 else
1367 einfo ("%B: definition of %s\n", abfd, name);
1370 if (command_line.cref || nocrossref_list != NULL)
1371 add_cref (name, abfd, section, value);
1373 return true;